User blog comment:X.Quicksilver.X/The Question Blog/@comment-31944442-20170509005011

1. Nature raises the stats of the Pokémon, if you look at a Pokémon stats and see a number that has a green color on that means it's raised, if its yellow it's lowered. Check the Pokémon base stats if see a Pokémon for an example a Gardevoir it has high sp attack and sp def you'd want a modest nature to boost it's high sp attack and lower it's bad physical attack.

2. Ivs or "Individual Values" are bonus stats that are randomized through out each stat, I'm not so sure about Ivs so you can research about it. Evs are known as "Effort Values" they are obtained by battling Pokémon, each Pokémon has their own Ev so beating that Pokémon will get you a point for that specific stat like for an example magikarp gives off 1 speed Ev so beating it will get you 1 point. The maximum amount of Evs you can get is 252 for 2 stats and 4 Evs for one other stat, which would equal 508 for a maxed out Ev trained Pokémon.

3. Hidden ability or HA is a ability obtained through dream world or a horde of Pokémon battle in the original games, while in this game you can breed for a HA, to know you have a HA research the Pokémon ability to see how many abilities a Pokémon has. For an example, Crawdaunt has 3 abilities Hyper Cutter, Shell Armor and it's HA, Adaptability if you get a Crawdaunr with Adaptability you have the HA. From what I saw in Lando's tweets he said he removed breeding for HAs, though I am not sure perhaps someone can inform me more about.